Update CHANGELOG.md for 12.8.9

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Update CHANGELOG.md for 12.8.9
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6709a46c · GitLab Release Tools Bot · 476c24b9 · 6709a46c
Commit 6709a46c authored Apr 14, 2020 by GitLab Release Tools Bot
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 - Improvement in token reference.


+## 12.8.9 (2020-04-14)
+
+### Security (3 changes)
+
+- Refresh ProjectAuthorization during Group deletion.
+- Prevent filename bypass on artifact upload.
+- Update rack and related gems to 2.0.9 to fix security issue.
+
+
 ## 12.8.7 (2020-03-16)

 ### Fixed (1 change, 1 of them is from the community)